class_docstr: Cache stores downloaded objects, notably apache-rat.jar. 
docstr: Remove a key (and the file) from the cache. 
docstr_tok: ["Remove","a","key","(","and","the","file",")","from","the","cache","."]
code: def delete(self, key):
      """Remove a key (and the file) from the cache."""
      path = self.get(key)
      if path:
          path.unlink()
  
file_path: arrow/dev/archery/archery/utils/cache.py
imports: from pathlib import Path
  import os
  from urllib.request import urlopen
  from .logger import logger
label_desc: Use image node_id 4 for calling the Cache obj's underlying member method code with example usage: obj.delete(key) without return types